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v M. 'P. ELLIOT. FURNACE FOR HEATING STEAM BOILERS. No. 331,287. Patented Dec. 1, 1885.

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FURNACE FOR HEATING" STEAM BOILERS.

110,331,287. Patented Dec. 1', 1885.

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UNITED STATES PATENT @Tricn.

MATTHEW-P. ELLIOT, OF CRYSTAL CITY, MISSOURI.

FURNACE FOR HEATING STEAM-BOILERS.

SPECIFICATION forming part of Letters Patent No. 331,287, dated December 1,1885.

Application filed June 20, 1885.

To all whom it may concern:

Be it known that I, MATTHEW P. ELLIOT, a citizen of the United States, residing at Crystal City, in the State of Missouri, have invented a new and useful Improvementin Furnaces for Heating Steam-Boilers, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, in which- I Figure 1 is a vertical longitudinal section on line 1 1 of Fig. 2, showing an arrangement of devices for carrying out the principles of my invention; Fig. 2, a horizontal section of the same on line 2 2 of Fig. 1; Fig. 3, a vertical transverse section of the same on line 3 3 of Fig. 1; Fig. 4, a vertical transverse section of the same on line 4 40f Fig. l.

The main object of my invention is to provide a practical and eficient means of using gas to heat a steam-boiler instead of the articles of fuel heretofore commonly in use for this purpose, and some of the advantages derived from my invention, which I am about particularly to describe, are, first, economy of fuel; second, doing away with smoke in and about the heating of a boiler; third, saving inthe wear and tear of boilers, inasmuch as the gas flame keeps the boiler sheets clean; and, fourth, in keeping the temperature underneath the boilers at a more even heat by doing away with the necessity of constantly opening and shutting doors,which allow of cold air suddenly entering to the boilers, when thereis a necessity of constantly replenishing the fires or cleaning the under part of the boilers.

Like letters refer to like parts in the drawings wherever they appear.

The construction of my invention is as follows: A represents the boilers. There may be as many of them or as few as desirable. Beneath these boilers A, and in such position as to leave a space underneath the-boilers, are situated a number of air'pipes, B. These airpipes are preferably flat in shape, as shown in Fig. 4, the object being to construct them in the most suitable manner to carry air and at the same time present the greatest amount of heat-absorbing surface. These air-pipes B are connected at their ends I) with an air-conduit 5o chamber, 0, and at their other ends, 1), air- Serial No. 169,269. (No model.)

pipes B open into an airchamber, D, which has preferably branch chambers d. Combustion-chambers E are situated immediately un der boilers A, and preferably, as shown in the drawings, underneath the front end of boilers A. These combustion-chambers E are surrounded, preferably on three sides, by the airchamber D, before mentioned, and its branches d, and these combustion-chambers E are prois closed or opened by means of the valve L.

This valve-chamber K opens directly into gasport hole G. Valve-chamber K is provided with a manhole or opening, M, which is kept closed, except when it may be desirable to clean out or repair parts immediately about valve-chamber K. Owing, however, to the construction and arrangement of the valve I, valve-chamber K, and its manhole M, and the direct connection of the valve-chamber K with the gas-port G, the manhole may be opened at such times as the valve I is closed, should it be desired for any purpose to admit cold air directly to the combustion-chamber E.

In the upper part of combustion-chamber E several suitable openings, 6', are made, through which products of combustion will find their way, passing thence underneath ICC 6o the boiler-plates.

chamber E is forced to rise, while the products of combustion escape directly below the forward end of the boiler through ports in the crown of the combustion-chamber as well as 5 from the throat of said combustion-chamber E.

from the pipes B through chambers D and d to the combustion-chamber E, and as the products of combustion pass out through openings 6, underneath the boilers A and over the pipes B, these air-pipes B are heated,and at the same I 5 time the heat radiated from the combustionchamber E heats the air-chamloer D and its branches d, and by the time the fuel used to start the fire in combustion-chamber E has become exhausted the air-pipes B and airchambers D d are thoroughly heated, so that the air being led from air'conduit 0 through pipes B to air-chambers D d enters combustion-chamber E through port-holes e in a conditiontoignite gas. ValveLis then opened,

2 so as to allow gas in gas-conduit chamber H to pass up through openings I into valvechamber K, and from thence through porthole G into combustion-chamber E, and then, gas and air mingling with each other under the conditions stated, combustion takes place, and

my improvement is in full operation thus: The products of combustion are passing out through exit-openings e of combustion-chamber along underneath the boilers A in the 5 direction of the arrows (see Fig. l) to the flue,

and at all times while this is going 'on the airpipes B and chambers D d are being heated, thus providing a constant supply of heated air for the combustion-chamber. The num- 0 her of combustion-chambers E is regulated at will according to the number of boilers used; but wherever a combustion-chamber is used it must be connected, as shown, with the airchambers and with the gas-producer, and it 5 must be provided with openings, through which the products of combustion may pass out and perform their proper office.

Among the great advantages derived from devices constructed and arranged substantially as hereinbefore set forth are the perfeet manner in which the fires can be controlled by increasing or decreasing the relative supply of gas and heated air, the readiness with which the temperature can be lowered 5 or the fire dampened by the admission of cool or non-heated air to the combustion-chamber, and the fact that when non-heated air is admitted it must first pass through the combustion-chamber and cannot strike directly on Added to these advantages are extreme simplicity of construction with thorough efiectiveness in operation.

I claim- 1. The combination, with a combustion cape of the products of combustion, of an air-chamber inclosing the base of said combustion-chamber and having ports for delivering air thereinto, air-pipes which deliver into the air-chamber, and a gassupply port which delivers into the combustion-chamber below the air-ports thereof, substantially as and for the purposes specified.

2. The combination, with a boiler having a smoke or waste-product chamber below it, of an independent combustion-chamber arranged in the smoke or waste-product chamber, said combustion-chamber having a gassupply below and ports in its crown for the escape of waste products, an air chamber which incloses the combustion-chamber and communicates therewith by suitable ports, and an air-supply delivering into the aihchamber, substantially as and for the purposes specified.

3. The combination, with a boiler having a waste-product chamber below it, of a combustion-chamber having ports in its crown for the escape of products of combustion, said chamber arranged below the boiler and in the waste-product chamber, an air-chamber which surrounds the combustion-chamber and has ports which deliver into the combustion-chamber, air-pipes arranged in the waste-product chamber below the boiler, and which deliver into the air-chamber, and gas-supply ports which deliver into the combustion-chamber, substantially as and for the purposes specified.

4. The combination, with a combustionchamber having an air-heating chamber surrounding it and ports of communication between the two chambers, of a gas supply main, a valve for controlling the entrance of gas into the valve-box, a valve-box having a port or man-hole, as at M, and a gas-port leading from the valve-box and delivering into the combustion-chamber, substantially as and for the purposes specified.

5. The combination, with a battery or plurality of boilers, of a series of independent combustion-chambers arranged in the wasteproduct chamber below the boilers,said chambers having crown ports 6, surrounding airchamber D d d d, having ports 6 leading into the several combustion-chambers, air-pipes B B, arranged in the waste-product chamber below the boilers and delivering into the airchamber D, gas-conduit H, a series of valveboxes, K, each having its port M, and gasports G, leading from the respective valveboxes to the corresponding combustion-chambers, whereby the fire at various points under the battery may be dampened and controlled at will, substantially as and for the purposes specified.

In testimony whereof I have affixed my signature, in presence of two witnesses, this 13th day of June, 1885.

MATTHEW P. ELLIOT.

Witnesses:

J. W. CRooKEs, PAUL BAKEWELL. 

